Hi Maybe with this morning's message I was tackling the task of specifically colouring certain maps from the wrong perspective.

From Therion Book.

colo[u]r <color> . set the map colour; this option overrides the automatic choice when the layout specifies colour map-fg [map]. So I expect colour map-fg to set the typical colour scheme for a map in a layout, and if I want exceptional override colours I specify these with selects in my thconfig. In thconfig select 97-HectorsWetPlan@MiddleEarth -colour [100 0 0] #red select 90-ToPoolPlan@MiddleEarth -colour [0 70 0] #green In layout colour map-fg [97 86 38] # yellow brown So for this 'fixed' map-fg the selects govern, as suggested by The Therion Book and as below, and I get exactly the effect I want. But with colour map-fg altitude, the selects are overridden. Although the selected coloured submaps appear on their own pdf layer, when the other layers are turned off, the submaps have the 'altitude' colours as seen below (and not the red or green colours that I might have hoped). Same thing happens with colour map-fg explo-date. So I think the behaviour suggested by the Therion Book is inconsistently implemented. I would prefer it if setting a colour for a particular map always overrode a general layout specification. Bruce